#include "stdio.h"
int lower_bits(int x,int n);
int main()
{
	int m,n;
	printf("shuru number and n \n");
	scanf("%d%d",&m,&n);
	printf("lower_bits:0x%x\n",lower_bits(m,n));
	return 0;
}
int lower_bits(int x,int n)
{
	int y=((1<<(n-1)-1)<<1+1)&x;
	return y;
	}
